Plaster-board lath.



y I. L I. E. SCHUMACHEH.

PLASTER BOARD LATH. APPLICATION FILED AuG.6. I9I5.-l

1,177,361. paIenIedMar. 28,1916.

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JOHN SCHU/ICHER AND J OSEPH E. SCHUVMCHER, 0F LUS ANGELES, CALIFOBBLIA.

@LASTRE-BOARD LALTH.

Specification of Letters Patent.

Patented Mar. 2S, 1916.

Application tiled August 6, 1915. /Serial No. 43,942.

To aZZ rwhom t may concern Be it known that we, JOHN SCHUMAGHER and .lossen E.` ScHUiuAcHiie, both citizens of the United States, residing at Los Angeles, in the county `of Los Angeles andI consisting of a plastic compositi on of plaster and sawdust or other finely divided material, which ordinarily is'incased between sheets of paper. This plaster-board is often employed to produce the final wall surface, by suitably decorating it. In accordance with the inventioi. we convert this plasterboard into lath by so forming it that the plaster applied to it to complete the Wall surface is caused to effectively grip thei plaster-board lath and be thereby anchored or held in position. This plaster-board lath is ordinarily formed in large sheets, which makes it possible to more quickly and inexpensively apply it than is the case when applying wood or metallic lath. It furtliermore provides a continuous lath structure which is firmer and more weatherproof, and produces a more air-and-heat tight wall formation. Such large sheets of plasterboard lath are applied directly to the building frame orceiling and wall beams by nail'- ing or in any other suitable manner, and when the-wall structure has. been so completed, the. plaster is applied over such plaster-board lath and becomes firmly anchored or attached thereto, due to the superficial formation of the plaster-board 'lath as will hereinafter be set forth. Furthermore, -such plaster-board lath is fireproof and is not subject to deterioration novel and useful formation andconstruction of plaster-board lath hereinafter described, shown in the drawing and finally pointed out in claims.

In the-drawing: Figure l is a face plan yiew of a sheet of plaster-.board lath formed in accordance with the invention; F ig. 2 is a sectional View of the same, taken upon the line :c2-m2, Fig.v l, looking in the direction ofA the appended arrows ;y Fig. 3 is an enlarged sectional View of a portion of the plasterboard lath in 'position as applied to the building structure, one of the beams or frame members of which is likewise shown in fragment, the plaster finish or surfacing being likewise shown as applied to the plaster-board lath; and, Fig. i is 'a view similar to Fig. l, showing a modified form of laster-board lath.

orresponding parts in all the figures are designated by the same reference characters. Referring with particularity to the drawing, and to .F igs. l to 3 thereof, inclusive, the improved plaster-board is shown as comprising a body A of lastie material commingled with finely divided wood or other substances, interposed between, or to which are applied, surface sheetsB of paper. This board is converted into lath by the production of a plurality of depressions, pits or Ikey pockets Z; which are produced inwardly of such plaster-board from one surface thereof, by a suitable tool which compresses' the material of the plaster-board and punches such pocket therein, shearing free a p0rtion of the paper covering -B at such surface of a size proportionate to the cross-section of the pocket, and punching the saine inwardly of the pocket produced. At the same time, or as the punching tool is withdrawn, the following edge of the punch, which pref` erably is carriedon a roller, lifts rup a portion of the paper covering B adjacentj'to the formed pocket, producing av lip or anchor c, this being due to the fact that the action upon the following edge of the rollercarried punch tool upsets or mutilates the wall of the pocket at the rearward edge thereof, beneath such paper covering, and in being withdrawn from thepocket lifts up the portion of the paper covering as stated,

to produce such lip. This is assuming that the roller, such as indicated at-D in Fig. 2,

in which 03 indicates the punches,4 moves upon its axis in contact with the plaster board sheet which is likewise moved in a liol straight-away path beneath the roller. The punches are,l applied to the roller in straight series, ano' the punches of the several series may be in staggered relation throughout the series. In the modified form shown in Fig. 4 in which a sheet of plaster-board lath is shown corresponding to that shown in Fig. 1, and provided with recesses or key pock- 'ets c, the paper covering B is elevated or distorted to produce lips or anchors f at adjoining sides of the key pockets, due to the fact that the roller (not show n), which produces such pockets has its punches set in series which extend diagonally over the face of the roller, orare in a sense slightly wound about the roller; the result being that as the plaster-board is passed beneath the rotating roller, two withdrawing faces of each punch mutilate the plaster-board body A, so as to raise up and produce such two lips or anchors f as such withdrawing faces of the punches retreat from the plaster-board. As indicated more particularly in Fig. 3, the lips or anchors c, and this will be true of the anchors f, are first projected more abruptly from the paper covering B in the formation of such lips or anchors, made necessary to accommodate the withdrawing punches. 'Afterward, such lips tend to bend slightly inwardly or toward `the plane of the plaster-board, as shown in full lines in Fig. 3. The first position of projection of such anchors is shown in dotted lines in Fig. 3.

` The final surface coating of plaster E is applied over the plaster-board lath, as shown in Fig. B, portions of the mass thereof entering the key pockets or recesses b and interlocking with the plaster-board lath, as clearly shown in Fig. 3 at g. In effect the plaster becomes directly united with the plastic composition constituting the body A of the plaster-board lath, coming into intimate contact and intimate association therewith, at the four sides of each key pocket as at k. Furthermore, the lips or anchors c protrude into and are embedded within the plaster mass or coating E, rmly interlocking therewith to produce a bonding effect,as is clearly indicated'in Fig. 3. The mutilation of the structure of the plaster-board body A, in the formation of the key pockets Z), upon the withdrawal of the following edges of the punches, as atlc, produces a more effective interlocking of such wall of the key pocket with the key or tongue g of plaster E, which is anchored in the respective pocket. The paper and the plastic mass E, of course, adhere, assisting in the function of holding the surface plaster to the plaster-hoard lath, but the tongues or keys g of the plaster more effectively andv to a high ldegree of positiveness interlock the plaster` coating with the plaster-board lath and'inti mately with theplastic body A thereof.

This, of course, is a much more positive association of the plaster and the plasterboard than would be possibly obtained by mere adhesion of the plaster to the paper covering B, for such adhesion would be no stronger in its holding effect than in the strength of the paper itself. In effect, the plaster-board of the invention produces a positive and unfailing anchorage of the plaster covering directly to the body or substantial result being practically a unitary structure. It thus results that there is much less danger portion of theY plaster-board,' the l or liability of the plaster covering becoming cracked or split and tending to leave the lath and fall. A wall or ceiling plasterl surface is thus provided which is more sightly in appearance, is devoid of the danger incident to falling, and the attendant loss.

-In Fig. 3 the plaster-board lath is shown Vas applied to a structural member G, such as a ceiling or wall beam, by a nail or other securing device Z.

It will be understood that the anchor c or the anchors f are bent outwardly from the remaining covering or paper B, as the following edge of the punch rises from the and features in producing and formingV plaster-board lath embodying the invention, all with respect to and in departure from the showing of the accompanying drawing and the disclosure of the foregoing description, and likewise 'all without departing from the spirit of the invention and a fair interpretation thereof.

Having thus disclosed our invention, we claim and desire to secure by Letters .Pat ent:

1. Improved plaster-board lath havinga plurality of pockets therein adapted to receive intruding portions of plaster covering in interlocking engagement to hold the plaster covering to the lath; said lath having a plastic body and surface coverings of flexible material; a portion of such flexible material at one margin of each such pocket being angularly directed outwardly from the plastic body to constitute an anchor within the plaster covering.

2. Improved plaster-board lath having a pluralityof pockets therein adapted to re- Ceive intruding portions of plaster covering in interlocking engagement to hold the plaster covering to tle lath;`said lath having a plastic body and surface coverings of flexil'ao y terial t one ble material.; a portion of such iexible maing directed angularly outwardly from the plastic body to constitute an anchor within the plaster covering and a portion of'th wall .of such pocket-inward of such anchor `being mutilated to present an uneven surface for direct engagement by such intruding plaster covering.

- 3. Improved plaster-board lath` havinga pluralityd of pockets therein adapted to receive intruding portions of plaster covering' in interlockmg engagement to hold the plaster covering to the lath; said lath having a plastic body and surface coverings of flexi-A ble material; a portion of such flexible material'at one margin of each such pocket being directed angularly aoutwardly' from the plastic body to constitute an anchor within the plaster covering, and a portion of the Wall of such pocket inward of such anchor being mutilated to present an uneven surface for direct engagement by such intruding plaster covering; said anchor of said rgin of each such pocket be exible 'covering overhanging such mutilated ocket wal l 4. mproved plaster-board lath having .a plurality of pockets therein adapted to receive intruding portions of plaster covering in interlocking engagement to hold the plaster covering to the lath; said lath having a plastic body and surface coverings of .ilexible material; a portion of such flexible material at one margin of each such pocket being directed outwardly from the ,plastic body to constitute an anchor within the plaster covering; a portion of the plastic4 body being directed outwardly with such anchor to reinforce the same. vIn testimony whereof, we have signed our names to this specication in the presence of two subscribing witnesses.

JOHN SCHUMACHER. .JOSEPH E. SCHUMACHER Witnesses:

ALFRED -H. DAEHLER, FRANCIS L. ISGBIGG.. 

